HETERO plugin ('HETERO:GPU,CPU') raises an error [GPU] Mismatch tensor
and port types: i64 vs i32
### Details:
- *Do not convert Result element type after Extension if required;*
- *Eliminate converts after the second call of the ConvertPrecisoin
pass;*
- *Support string input in the `benchmark_app`*.
### Tickets:
- *136752*